rockwell



(No Model.) 2 Sheets-Sheet 1.

A. F. ROCKWELL. DOOR BELL MECHANISM.

No. 431,918. Patented July 8, 1890 2 Sheets-Sheet -2.

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ALBERT F. ROCKXVELL, OF BRISTOL, CONNECTICUT, ASSIGNOR TO THE NElVDEPARTURE BELL COMPANY.

DOOR-BELL MECHANISM.

SPECIFICATION forming part of Letters Patent No. 431,918, dated July 8,1890.

Application filed February 10, 1890. Serial No. 339,874.. (No model.)

To aZZ whom it may concern.-

Be it known that I, ALBERT F. ROCKWELL, of Bristol, in the county ofHartford and State of Connecticut, have invented a certain new anduseful Improvement in Door-Bell Mechanism, of which the following is aspecification, reference being had to the accompanying drawings.

The object of my invention is to produce a IO simple and economicaldoor-bell to be operated by a pull upon a knob in the usual way; and myinvention consists in the peculiar construction and organization ofparts, which I will describe in detail.

In the accompanying drawings, Figure 1 is atop view of my door-bellmechanism with the bell removed, the dotted lines indicating the partsbelow the disk. Fig. 2 is a bottom view of the same with the bottomplate removed. Fig. 3 shows the bell-hammer detached, so as toillustrate how it is pivoted and connected with related parts. Fig. a isa diagrammatical View showing my improved door-bell mechanism appliedand Fig. 5 is a detached view of the bottom plate for undercovering themechanism which is below the disk.

Referring to the letters, A represents a disk which supports all of theoperating mechan- 0 ism.

B indicates a central post extending upward from the upper side of thedisk forsupporting the bell.

C in Fig. 4: indicates a screw, which may be 3 5 used to secure the bellto this post. Around the base of the post is a coiled spring D, securedat one end (Z to the post and at the other end (1 projecting through acurvilinear slot (Z in the disk and engaging with a segmental plate E,pivoted at F to the under side of the disk. This segmental plate isprovided with a curvilinear slot G, the margins of which are toothed, asclearly shown in Fig. 2, leaving a zigzag way. The plate is alsoprovided with cogs II, which gear with cogs I upon a lever K, pivoted atL, and connected with a bell-wire at its outer end M.

M indicates a stop on the lower side of the disk to limit the rotarymovementof the seg- 5o mental plate.

N indicates a bracket secured to the upper face of the disk and aidingto support a post.

0, which forms the pivot of the bell-hammer P, as clearly illustrated inFig. 3, where Q is a short hollow cylinder surrounding thepost 5 5 andhaving secured to it the handle of the bell-hammer.

R indicates an arm projecting from the cylinder Q, bent downward atrightangles, so as to extend through a slot S in the disk and enter thezigzag curvilinear slot G in the segmental plate E.

T, Fig. 5, shows a bottom cap-plate screwed to place by screws U V. Thiscap-plate is provided with a small opening (see Fig. 5) to accommodatethe movements of the free end of the arm R. It is also provided withprojections X on either side, by means of which the bell mechanism maybe screwed to place in use.

Y indicates a projection on one side of this plate to fit in a recess Zin the rim a of the disk.

The operation of my improved bell-ringing mechanism is as follows: Apull upon the bell- 7 5 knob 17 (see Fig. 4) operates the bell-cranklevers 0 through the wires d to turn the lever K upon its pivot. Thislever, being geared with the segmental plate E, rotates the plate on itspivot, which causes the teeth that. form the margins of the curvilinearslot G to strike alternately against the end of the arm R and cause itto vibrate, which vibrates the bellhammer and produces a clatteringstroke upon the bell. As soon as the pull upon the bell-knob is relaxedthe coiled spring D returns the segmental plate and the lever K to theiroriginal positions and continues the clattering stroke upon the belluntil the segmental plate strikes against the stop M Thus a pull uponthebell-knob causes a clattering stroke upon the bell about equal totwice the duration of the pull, which affords a very good imitation ofan electric bell.

\Vhat I claim is 1. The combination, with the disk having the centralpostfor supporting the bell, of the coiled spring around the post, thesegmental plate connected with the free end of the spring, and thepivoted lever K, geared with the segmental plate, and its free endprojectzag Way in the segmental plate, substantially ing out forconnecting with the pull-wire d, as set forth.

substantially as set forth. In testimony of all which I have hereunto 2.The combination, with the disk, of the subscribed my name.

segmental plate and pivoted operating-lever ALBERT F. ROCKXVELL. K,geared together, the bell, the coiled spring WVitnesses:

for operating the segmental plate, the pivoted E. D. ROCKWELL,

bell-ham mer, and the arm R, entering the zig- ETTA 13. SPRING.

